chip9 emulator

about

emulator for the imaginary CHIP9 cpu architecture, described in the pdf. written in C for good speed.

includes disassembler, fast 8bit SDL rendering.

bugs

this emulator assumes little endian CPU. the addx command probably doesn't set the flag register as expected. it was almost impossible to figure out the semantics for 16 bit store. i ended up copying some macros from gnubuy (targetting Z80 cpu), but even that didn't work, so i patched the bootrom to skip the problematic code (was basically only a dumb loop to slow down the emulator). the app rom also needed a patch because when its execution starts, the N flag isn't set as expected.